46 lines
1.4 KiB
Rust
46 lines
1.4 KiB
Rust
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#![warn(clippy::implied_bounds_in_impl)]
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#![allow(dead_code)]
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use std::ops::{Deref, DerefMut};
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trait Trait1<T> {}
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// T is intentionally at a different position in Trait2 than in Trait1,
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// since that also needs to be taken into account when making this lint work with generics
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trait Trait2<U, T>: Trait1<T> {}
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impl Trait1<i32> for () {}
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impl Trait1<String> for () {}
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impl Trait2<u32, i32> for () {}
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impl Trait2<u32, String> for () {}
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// Deref implied by DerefMut
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fn deref_derefmut<T>(x: T) -> impl Deref<Target = T> + DerefMut<Target = T> {
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Box::new(x)
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}
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// Note: no test for different associated types needed since that isn't allowed in the first place.
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// E.g. `-> impl Deref<Target = T> + DerefMut<Target = U>` is a compile error.
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// DefIds of the traits match, but the generics do not, so it's *not* redundant.
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// `Trait2: Trait` holds, but not `Trait2<_, String>: Trait1<i32>`.
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// (Generic traits are currently not linted anyway but once/if ever implemented this should not
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// warn.)
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fn different_generics() -> impl Trait1<i32> + Trait2<u32, String> {
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/* () */
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}
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trait NonGenericTrait1 {}
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trait NonGenericTrait2: NonGenericTrait1 {}
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impl NonGenericTrait1 for i32 {}
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impl NonGenericTrait2 for i32 {}
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// Only one bound. Nothing to lint.
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fn normal1() -> impl NonGenericTrait1 {
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1
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}
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fn normal2() -> impl NonGenericTrait1 + NonGenericTrait2 {
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1
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}
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fn main() {}
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